MELBOURNE, Australia -- Early-round losers at the Australian Open will receive a significant pay raise as part of what tournament organizers say is the biggest purse in tennis history. Responding to player demands for a bigger slice of the prize money, Tennis Australia moved to avert a potential boycott of the opening Grand Slam of the year. The 2013 singles champions at Melbourne Park in January each will collect 2.43 million in Australian dollars ($2.55 million) from a record total purse of nearly AU$31 million.